Pregnancy possibilities?

I had unprotected sex last night but my boyfriend pulled out. I am not on the pill and I understand this was a very stupid decision on both of our behalfs and I will not let it happen again. According to the period calendar on here I am currently ovulating which I know increases the possibility alot. I dont know what to do because I live in a rural area where the only pharmacy (where I can buy plan b) is closed until tuesday which will be far too late. What is the actual possibility of me getting pregnant considering he didnt finish in me? I am so scared rn :(